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Table 1 X-ray (0.1 to 0.8 nm) peak flux intensities for different classes of flares

From: Space weather effects on the low latitude D-region ionosphere during solar minimum

Class Peak flux intensities (W/m2)
A I < 10−7
B 10−7 ≤ I < 10−6
C 10−6 ≤ I < 10−5
M 10−5 ≤ I < 10−4
X 10−4 ≤ I